Fix flaky python test

[GumpacG]

Fix flaky gremlin-python test: test_client_side_timeout_set_for_aiohttp

The test asserted str(err) == "" on the caught timeout, assuming a bare asyncio.TimeoutError (empty message). But the driver arms two read-timeout timers at the same value the driver's asyncio.timeout wrapper and aiohttp's sock_read timer and whichever fires first is a race. When aiohttp's wins, the error is a SocketTimeoutError ("Timeout on reading data from socket"), so the message assertion fails intermittently (seen on python-3.11 and python-3.12 across runs).

Fix: drop the brittle message-equality assertion. The test still catches TimeoutError (both variants subclass it), still fails if no timeout occurs, and still verifies the client recovers afterward, it just no longer pins a library-internal message string.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.23%. Comparing base (a28cd1f) to head (4a67bce).
⚠️ Report is 187 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3507      +/-   ##
============================================
- Coverage     76.35%   76.23%   -0.13%     
- Complexity    13424    13934     +510     
============================================
  Files          1012     1030      +18     
  Lines         60341    62874    +2533     
  Branches       7075     7368     +293     
============================================
+ Hits          46076    47934    +1858     
- Misses        11548    11961     +413     
- Partials       2717     2979     +262     

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